221463881 has 2 divisors, whose sum is σ = 221463882. Its totient is φ = 221463880.

The previous prime is 221463871. The next prime is 221463887. The reversal of 221463881 is 188364122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134676025 + 86787856 = 11605^2 + 9316^2 .

It is a cyclic number.

It is not a de Polignac number, because 221463881 - 2¹⁴ = 221447497 is a prime.

It is a super-2 number, since 2×221463881² = 98092501175164322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221463887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110731940 + 110731941.

It is an arithmetic number, because the mean of its divisors is an integer number (110731941).

Almost surely, 2^221463881 is an apocalyptic number.

It is an amenable number.

221463881 is a deficient number, since it is larger than the sum of its proper divisors (1).

221463881 is an equidigital number, since it uses as much as digits as its factorization.

221463881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 35.

The square root of 221463881 is about 14881.6625751292. The cubic root of 221463881 is about 605.0170803183.

The spelling of 221463881 in words is "two hundred twenty-one million, four hundred sixty-three thousand, eight hundred eighty-one".